The GS 430 is not cheaper than the M45.
Even w/ less equipment it's base price is more.The warranty on the Infinti is actually 10,000 miles longer (I migth be wrong tho so I am willling to be educated).
And while Lexus has a decent resale value the GS is a bit or a rarer model so has a limited market as well.
In a 40,000 car no way the difference in resale value will be a quarter of the full <new> car price.
And while <some> dont like the looks of the M45, love 'em inside and out, while I feel the GS look is getting a bit long in the tooth (and kinda common too).